Water treatment device



FIG. 1 is a perspective view of a water treatment device showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a right side view thereof.

The broken line showings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a water treatment device, as shown and described. 